Part of the Kubota Repair Manuals.
This Kubota Shop Manual covers the KX91-3 and KX101-3 compact excavators, powered by the D1503-M-BH-1 and D1503-M-BH-2 diesel engines. It is the factory service document, publication 97899-60520, running 610 pages.
The manual is split into machine body, engine, hydraulic system, and electrical system, each with mechanism and service sections, plus optional units. It gives the construction and function of the major components together with troubleshooting charts, servicing specifications, and torque values, such as a main relief pressure of 23.5 MPa on the KX91-3 and 25.0 MPa on the KX101-3, and valve clearance of 0.18 to 0.22 mm cold.
It is the correct resource for diagnosing hydraulic weakness, travel and swing faults, and engine trouble on these excavators. It is delivered as a downloadable PDF you can search, print, and use on any device.
What's Inside This Kubota KX91-3, KX101-3 Manual
| System | Pages | Key Topics |
|---|---|---|
| I. General | - | Body and Engine Identification Marks, Safty Precautions for Servicing |
| Ii. Machine body(Mechanism Section) | - | Front Attachment (Greasing Points, Bucket Interchangeability), Swivel Frame and Components (Accel Lever, Auto Idle-Version, Accel Cable, Swivel Bearing) |
| Ii. Machine body(Service Section) | - | Specifications (Machine Weight, Machine Specifications, Lever Stroke and Operating Force, Dimensions of Parts) |
| Iii. Engine(Mechanism Section) | - | Specification & Features (Specifications), Fuel Injection Pump (Structure, Precaution of Removing Reassembly) |
| Iii. Engine(Engine WSM (Addition)) | - | General (Engine Identification, Tightening Torques, Troubleshooting, Servicing Specifications, Maintenance Check List, Check and Maintenance, Special Tools) |
| Iv. Hydraulic system(Mechanism Section) | - | Features of Hydraulic System, Hydraulic System Specifications, Main Pump (Structure & Specifications, Performance Curve) |
| Iv. Hydraulic system(Service Section) | - | Troubleshooting (Common Circuit, Front Attachment, Swivel Circuit, Travel Circuit) |
| V. Electrical system(Mechanism Section) | - | Outline, Components & Harness Layout, Couplers, KX91-3, 101-3 Standard Version |
| V. Electrical system(Service Section) | - | Electrical System, Front Attachment, Engine Electrical System, Auto Idle System, Auto Glow Controller, Auto Release Controller |
| Vi. Optional Units | - | A. KTA-Version (Actual Service Port Flow : KX91-3 KTA-Version Only, Breaker Performance Test Sample : KTA-Version Only), B. KTC-Version |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Travel motor Relief valve tightening torque | 58.8 ~ 68.6 N·m (6.0 ~ 7.0 kgf·m) | p. 374 |
| Travel motor Plug tightening torque | 58.8 ~ 68.6 N·m (6.0 ~ 7.0 kgf·m) | p. 374 |
| Swivel motor Relief valve assembly tightening torque | 58.8 ~ 68.6 N·m (6.0 ~ 7.0 kgf·m) | p. 245 |
| Swivel motor Shockless piston Plug tightening torque | 58.8 ~ 68.6 N·m (6.0 ~ 7.0 kgf·m) | p. 245 |
| Pilot filter Durable pressure | 70kgf/cm2 | p. 256 |
| Pilot filter Filtering rate | 10 µ | p. 256 |
| Fuel filter Ring nut tightening torque | 15 N·m (150 kg·cm) | p. 92 |
| Fuel filter Filtering area | 800cm2 | p. 92 |
| Air filter Outer element Filtering area | 1.0m2 | p. 93 |
| Air filter Inner element Filtering area | 262cm2 | p. 93 |
| Fan belt deflection (force for check) | 98 N (10 kgf, 22 lbs) | p. 130 |
| Fan belt deflection (factory spec) | 7.0 to 9.0 mm (0.28 to 0.35 in.) | p. 130 |
Kubota KX91-3, KX101-3 Common Problems This Manual Covers
Weak or slow hydraulic functions
Low hydraulic oil, a clogged filter, air in the system, or internal wear make the functions weak, slow, or intermittent. The hydraulic service section covers circuit troubleshooting and repair for the front, swivel, and travel circuits.
Manual Section: IV. Hydraulic system(Service section) p. 271Overheating or high-temperature warnings
Low coolant, dirty radiator fins, a loose fan belt, or a blocked air filter drive up engine temperature. The engine addition section covers cooling checks and maintenance, including a fan belt deflection of 7 to 9 mm.
Manual Section: III. Engine(Engine WSM (Addition)) p. 99Weak or jerky travel and swing
Hydraulic leakage, pilot pressure faults, or wear in the swing bearing and drive components make travel and swing weak or jerky under load. The hydraulic mechanism section explains the main pump, motors, and their performance.
Manual Section: IV. Hydraulic system(Mechanism section) p. 211Hard starting, stalling, or power loss
Fuel contamination, water in the fuel, a clogged filter, or a battery fault leave the engine hard to start or down on power. The engine addition section covers troubleshooting, servicing specifications, and the fuel injection system.
Manual Section: III. Engine(Engine WSM (Addition)) p. 99Pin wear or linkage looseness
Missed greasing and neglected inspection cause pin wear and looseness in the boom, arm, and bucket linkage. The machine body service section covers swing bracket pins and bushes and how to measure and correct looseness.
Manual Section: II. Machine body(Service section) p. 35Electrical or charging faults
Loose connectors, harness damage, or a charging fault cause warning lights and accessory problems. The electrical service section covers checking, disassembling, and servicing the electrical components.
Manual Section: V. Electrical system(Service section) p. 491Frequently Asked Questions
Which excavators does this manual cover?
It covers the Kubota KX91-3 and KX101-3 compact excavators, which use the D1503-M-BH-1 and D1503-M-BH-2 diesel engines.
Does it give travel and swing motor torque specs?
Yes. The hydraulic service section lists torques such as the travel motor relief valve at 58.8 to 68.6 N·m and the counterbalance valve at 235.0 to 245.0 N·m. p. 271
Does it cover engine servicing?
Yes. The engine addition section includes engine identification, tightening torques, troubleshooting, servicing specifications, and the maintenance check list, with a fuel injection pressure of 13.7 to 14.7 MPa. p. 99
What format is this Kubota KX91-3 manual in?
This is a 610-page searchable PDF ready for immediate download. Works on any device, pull it up on your phone while you're under the hood. No shipping, no waiting.
Are there any print restrictions on this Kubota KX91-3 manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Is there a wiring diagram in this Kubota KX91-3 Shop Manual?
Yes, full electrical schematics are included with wire colors, connector locations, and circuit descriptions.
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